Silicon Laboratories SI2493/57/34/15/04, SI2494/39 Can Monitor, U70 Bit Function, Ppd, Ocd, Cid

AN93

		Table 20. Register U70 Signals	INT			Can Monitor
Signal	U70 Bit	Function
DCD	0	Data Carrier Detect—active high (inverse of						pin)
							DCD
RI	1	Ring Indicator—active high (inverse of			pin)
				RI
PPD	2	Parallel Phone Detect
OCD	3	Overcurrent Detect
CID	4	Caller ID Preamble Detect

CTS

Tx Data

1024 Character Elastic		Tx Buffer
	SRAM			Deasserts
			CTS
	796 Characters
14-Character				Transmit
Hardware
Buffer

128 Characters

CTS Asserts

		Figure 3. Transmit Data Buffers
		1024 Character Elastic	Rx Buffer
		SRAM
		796 Characters
Parallel	RXF bit
Mode	REM bit	12-Character	Receive
	Rx data	Hardware
		Buffer
	RTS

128 Characters

Figure 4. Receive Data Buffers

22 Rev. 1.3